Steam-generator



(No Model.)

M. PIERCE & F. THOMAS.

STEAM GENERATOR.

No. 389,008. Patented Sept. 4, [8 88,

ijwmwtow Milt f l fca 1 15 N. PETERi Plvolmmhcqnphcr. Whh'nglm n. c.

llhvrrn rains Parent @rrrc MELVIN PlERCE AND FRANK THOMAS, OF NEYV HARTFORD, IOXVA.

STEAM-GENERATOR.

SJPBCIPICATION forming part of Letters Patent No. 389,008, dated September 4:, 1888.

Application filed March 10, 1888.

219 (Ml whom it may concern:

Be it known that we, MELVIN PIERCE and FRANK THOMAS, citizens of the United States, residing at New Hartford, in the county of Butler and State of Iowa, have invented new and useful Improvements in Steam-Generators, of which the following is a specification.

This invention relates to steam-generators designed for agricultural and domestic purposes; and it consists in theimproved construction hereinafter described,whereby an efficient and simple generator is provided wherein the several parts of the same are readily and durably connected.

In theaccompanying drawings, forming part of this specification, Figure 1 is a side View of a generator embodying our improvements. Fig. 2 is a longitudinal section. Fig. 3 is a front view of the generator. Fig. a is a detail sectional view. Fig. 5 is a transverse section on the dotted line a: a: of Fig. 1.

lhe front plate, A, and rear plate, B, are provided upon their inner sides with circular horizontal flanges a, which the ends of the cylindrical shell 0, forming the body, embrace, so as to permit said shell to be bolted to said flanges to rigidly connect the body and its front and rear plates. The front plate, A, is provided on its inner side with a second circular horizontal flange, 6, within and concen trio with the flange a, but smaller than the same to adapt it for the attachment of the front end of the cylinder 1), forming the fire-chamher. The fiangejoints are well packed before bolting to make them air and water tight. It will be understood that in order to secure strength as well as lightness the front and rear plates are made of cast metal, while the inner and outer cylinders are preferably of galvanized sheet metal.

By reference to Figs. land 2 itwill he noted that the exterior face of the shell 0 has united thereto adjacent to its ends a series of horizontal bolt-rods, c, the ends of which extend beyond the end edges of the shell and are threaded for the engagement of nuts d. The outer marginal portion of both the front and rear plates projects beyond the shell, so as to form annular flange portions c, which are perforated for the passage of the ends of the rods to clamp the parts together by the nuts d. Similar bolt-rods, d, are secured on the outer Serial No. 266,812. (No modem a vertical pintle-rodJt, upon which swings the door F of a form designed to close said opening, and having a loop, f, in its outer side tolimit the vibrations ofa latch-lever,f pivoted on the outer side of the door and designed to engage a notched catch, f, on the front plate. The opening in the front plate is circular, while the door is of such size that it will leave the upper portion of said opening uncovered. At each side of said upper portion and on the faceplate are secured vertical straps g, which form guides for receiving the horizontal tonguesg. extending from the sides of an arc-shaped plate, G, designed to close the upper portion of said opening and having asmoke-pipe and elbow-connection. This plate G is also adapted to be bolted to the front plate.

A horizontal guide-flange, H, is secured on the outer side of the door, near the bottom thereof, and parallel above said flange is a horizontal strap, H, forming a guide for the shank of a loop-handle, h'-, attached to a damper-plate, H which slides in the guide formed by the flange H, and is bent atits ends to provide stops to limit its movement. The latter and the front plate are each provided with a series of perforations, if, which are adapted to register to a greater or less degree according to the amount of draft desired.

The length of the cylinder Dis such that it terminates short of the rear end to form an intermediate end boilerspace communicating with the rest of the boiler-chamber. The said rear end consists of a circular plate, I, provided radially with a series of projections, i,

to enable the said rear plate to be properly braced and supported at its rear end. The plate I is also bolted in position the same as the front and rear plates are secured to the outer shell.

A'serics of tubes, 3, are arranged transversely in the upper part of the fire-chamber, as shown in Figs. 2 and 5, and said tubes J connect the opposite sides of the boiler-chamber. As seen in Fig. 5, the tubes alternate, so that one series inclines in one direction and the remaining in the other. A grate, J, is located in the fire-chamber, and in the upper portion of said chamber is a longitudinal plate, J, which terminates short of the rear plate, so as to form a passage at the rear of said fire-chamber to make a return-flue above the plate J, which return-draft communicates with the chimney. I

A faucet or screw-cap, 2' is located in the lower part of the rear plate to draw oft hot water when necessary. On the upper part of said plate is located a eoek,j, designed for blowing off air at the lower Water-line. On the upper side of the shell, near the rear end thereof, is located a steanrdome, K, which communicates with the boiler space. The cap of said dome is secured in position by means of a flange, 10', depending from said cap and extending into the upper portion of the domecylinder. The flange 7c is beveled or inclined upon its outer side, so that a packing of Babbitt metal can be placed against said face and the upper endof the domecylinder pressed down and locked securely to said flange by means of a metal band, It", shrunk thereon. A cock, Z, is located on the side of the steamdome to blow 0H air at the upper water-line. A safety-valve, z", and check-valve Z are located upon the dome. A water-tank. L, is located on the top of the boiler, and is supported in position by resting upon supports 122, said tank L communicating with the boiler by means of a pipe, 12, provided with a cock, at. The upper parts of the steam dome and watertank communicate through a pipe, 0, also provided with a cock, 0. A threaded neck, 1), in the top of said supply-chamber is provided with a removable threaded plug, 19, to enable said tank to be readily replenished when necessary.

In use the boiler is filled with the necessary quantity of water, and, the fire beingstarted, steam is generated and passes to the dome,

from which it can be led off to any point for any purpose. The tubes passing across the upper portion of the fire-chamber brings the water in quantities over the action of the firechamber that will enable it to be quickly heated. The longitudinal plate insures the extended travel of the products of combustion through the structure, so as to secure the greatest benefit therefrom.

By opening the cock 0 a portion of the steam can be led from the dome to the tank to maintain the water in the latter at a temperature suitable for feeding to the boiler.

The several parts of the structure are so disposed and arranged that they can be readily and cheaply formed and quickly put together to do effective service. The parts designed to stand the strain are made of cast metaland the other parts of galvanized metal, in order to secure both strength and lightness.

\Ve cluin1 1. The combination, with the boiler having a circular opening in its end, of the plate carrying an escape-pipe and removably secured to the front end of the boiler and adapted to close the upper portion of said circular opening, as set forth.

2. The combination, in a boiler, of a castmetal front having a circular opening therein, a plate carrying a smoke-pipe and bolted to the upper part of the opening, and a swinging door to close the balance of said opening, substantially as specified.

3. The combination, with the body, of the steam-dome provided with a cast-metal head and having flange embraced by the upper portion of said dome and ashrunk secnringband, substantially as specified.

In testimony that we claim the foregoing as our own we have hereto afiixed our signatures in presence of two Witnesses.

MELVIN PIERCE. FRANK THOMAS.

\Vitnesses:

E. L. PIERCE, O. A. ENSIGN. 

